Wednesday, December 5, 2012

1212.0175 (Bin Shao et al.)

Manipulating the magnetic anisotropy of cobalt doped titanium dioxide by
carrier accumulation

Bin Shao, Min Feng, Hong Liu, Jian Wu, Xu Zuo
Based on first-principles calculations, we predict that the magnetic anisotropy energy (MAE) of Co-doped TiO$_2$ sensitively depends on carrier accumulation. This magnetoelectric phenomenon provides a promising route to directly manipulate the magnetization direction of diluted magnetic semiconductor by external electric-fields. We calculate the band structures and reveal the origin of carrier-dependent MAE in k-space. In fact, the carrier accumulation shifts the Fermi energy and tunes the dominant contributions to MAE. The first-principles calculations provide a straightforward way to design spintronics materials with electrically controllable spin direction.
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